* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f4f4f4;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

h1 {
  text-align: center;
  margin-bottom: 30px;
  color: #2c3e50;
}

h2 {
  margin-bottom: 15px;
  color: #3498db;
}

.upload-section, .files-section {
  background-color: #fff;
  border-radius: 5px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.form-group {
  margin-bottom: 15px;
}

input[type="file"] {
  display: block;
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  background-color: #f9f9f9;
}

small {
  display: block;
  margin-top: 5px;
  color: #7f8c8d;
}

.btn {
  display: inline-block;
  background-color: #3498db;
  color: #fff;
  padding: 10px 15px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  transition: background-color 0.3s;
}

.btn:hover {
  background-color: #2980b9;
}

.result {
  margin-top: 15px;
  padding: 10px;
  border-radius: 4px;
  min-height: 50px;
}

.success {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.error {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

#filesList {
  list-style: none;
  margin-top: 15px;
}

#filesList li {
  padding: 10px;
  border-bottom: 1px solid #eee;
}

#filesList li:last-child {
  border-bottom: none;
} 